/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/*
 * Copyright 2003-2005 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.sun.org.apache.xerces.internal.xinclude;

import com.sun.org.apache.xerces.internal.xni.NamespaceContext;

/**
 * This is an implementation of NamespaceContext which is intended to be used for
 * XInclude processing.  It enables each context to be marked as invalid, if necessary,
 * to indicate that the namespaces recorded on those contexts won't be apparent in the
 * resulting infoset.
 *
 * @author Peter McCracken, IBM
 */
public class XIncludeNamespaceSupport extends MultipleScopeNamespaceSupport {

  /**
   * This stores whether or not the context at the matching depth was valid.
   */
  private boolean[] fValidContext = new boolean[8];

  /**
   *
   */
  public XIncludeNamespaceSupport() {
    super();
  }

  /**
   * @param context
   */
  public XIncludeNamespaceSupport(NamespaceContext context) {
    super(context);
  }

  /**
   * Pushes a new context onto the stack.
   */
  public void pushContext() {
    super.pushContext();
    if (fCurrentContext + 1 == fValidContext.length) {
      boolean[] contextarray = new boolean[fValidContext.length * 2];
      System.arraycopy(fValidContext, 0, contextarray, 0, fValidContext.length);
      fValidContext = contextarray;
    }

    fValidContext[fCurrentContext] = true;
  }

  /**
   * This method is used to set a context invalid for XInclude namespace processing.
   * Any context defined by an &lt;include&gt; or &lt;fallback&gt; element is not
   * valid for processing the include parent's [in-scope namespaces]. Thus, contexts
   * defined by these elements are set to invalid by the XInclude processor using
   * this method.
   */
  public void setContextInvalid() {
    fValidContext[fCurrentContext] = false;
  }

  /**
   * This returns the namespace URI which was associated with the given pretext, in
   * the context that existed at the include parent of the current element.  The
   * include parent is the last element, before the current one, which was not set
   * to an invalid context using setContextInvalid()
   *
   * @param prefix the prefix of the desired URI
   * @return the URI corresponding to the prefix in the context of the include parent
   */
  public String getURIFromIncludeParent(String prefix) {
    int lastValidContext = fCurrentContext - 1;
    while (lastValidContext > 0 && !fValidContext[lastValidContext]) {
      lastValidContext--;
    }
    return getURI(prefix, lastValidContext);
  }
}
